NodeJS is a java script framework which works over V8 Engine.
Which translate V8 into machine code directly based on the processor type, a mapping of code from java script into machine code is done.
Also Node JS is an asynchronous event driven framework, Node.js is designed to build scalable network applications. In the following "hello world" example, many connections can be handled concurrently. Upon each connection the callback is fired, but if there is no work to be done Node is sleeping.
http://www.youtube.com/watch?v=hWhMKalEicY
